[jira] [Created] (IMPALA-10083) Improve row count estimates when stats are not available

["Sahil Takiar (Jira)" <ji...@apache.org>]

Sahil Takiar created IMPALA-10083:
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             Summary: Improve row count estimates when stats are not available
                 Key: IMPALA-10083
                 URL: https://issues.apache.org/jira/browse/IMPALA-10083
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
            Reporter: Sahil Takiar


There are various improvements that we can make to estimate row count stats even if stats are not available for a table.

There are various factors to consider here:
 * Handling for partitioned vs. non-partitioned tables
 ** Handling for partitioned tables can be a bit tricky if the table is in a mixed state - some partitions have row counts while other don't
 * Interoperability with other systems such as Hive and Spark
 * Users can run alter table statements to manually set the value of the row count

The JIRA will be used to track the various improvements via sub-tasks.



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